Thin-Walled Structures最新文献

Numerical investigation on the dynamic behavior of thermoplastic fiber-metal laminates subject to confined explosion loading

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-04-22 DOI: 10.1016/j.tws.2025.113354

Xiangshao Kong , Zihan Zhu , Cheng Zheng , Hu Zhou , Weiguo Wu

A numerical simulation study was conducted to investigate the dynamic response and failure behavior of thermoplastic fiber-metal laminates (TFMLs) under confined explosion conditions. To simulate the response of TFMLs to high-impact loads, a subroutine was developed incorporating the strain rate effect. In addition, a surrogate model for predicting the dynamic response of TFMLs was established by employing parametric modeling combined with Gaussian process regression analysis. Bayesian optimization of the thickness ratios for each layer group of the laminates was performed, using lightweight and protective performance as the comprehensive evaluation indices. The results indicate that incorporating the strain rate effect facilitates reliable characterization of both overall deformation and internal damage of TFMLs. The deviation of peak deflection between the numerically calculated value and experimental results is approximately 3 %, while the error for residual deflection is <10 %. A comparative analysis shows that the strain rate effect has significant influence both on the overall deformation and internal fiber damage of the blast loaded TFMLs. Furthermore, optimizing the thickness of each stack achieved an 11.9 % reduction in areal density and a 1.6 % reduction in residual deflection compared to those of the original design scheme. Increasing the metal thickness ratios on the front and rear faces of the laminated structure was shown to significantly enhance its protective performance. This research will contribute to advancing methodologies for analyzing the dynamic response and optimizing the structural design of TFMLs.

{"title":"Numerical investigation on the dynamic behavior of thermoplastic fiber-metal laminates subject to confined explosion loading","authors":"Xiangshao Kong , Zihan Zhu , Cheng Zheng , Hu Zhou , Weiguo Wu","doi":"10.1016/j.tws.2025.113354","DOIUrl":"10.1016/j.tws.2025.113354","url":null,"abstract":"<div><div>A numerical simulation study was conducted to investigate the dynamic response and failure behavior of thermoplastic fiber-metal laminates (TFMLs) under confined explosion conditions. To simulate the response of TFMLs to high-impact loads, a subroutine was developed incorporating the strain rate effect. In addition, a surrogate model for predicting the dynamic response of TFMLs was established by employing parametric modeling combined with Gaussian process regression analysis. Bayesian optimization of the thickness ratios for each layer group of the laminates was performed, using lightweight and protective performance as the comprehensive evaluation indices. The results indicate that incorporating the strain rate effect facilitates reliable characterization of both overall deformation and internal damage of TFMLs. The deviation of peak deflection between the numerically calculated value and experimental results is approximately 3 %, while the error for residual deflection is <10 %. A comparative analysis shows that the strain rate effect has significant influence both on the overall deformation and internal fiber damage of the blast loaded TFMLs. Furthermore, optimizing the thickness of each stack achieved an 11.9 % reduction in areal density and a 1.6 % reduction in residual deflection compared to those of the original design scheme. Increasing the metal thickness ratios on the front and rear faces of the laminated structure was shown to significantly enhance its protective performance. This research will contribute to advancing methodologies for analyzing the dynamic response and optimizing the structural design of TFMLs.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"214 ","pages":"Article 113354"},"PeriodicalIF":5.7,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical characteristics of novel multistable hybrid cellular structures with adjustable macro-Poisson's ratio

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-04-22 DOI: 10.1016/j.tws.2025.113356

Ran Liu , Changhai Chen , Yuansheng Cheng

To achieve superior energy absorption capacity with multi-plateau stresses, a novel type of multistable hybrid cellular (MHC) structure was constructed through the hybridization of positive, negative, and zero Poisson's ratio cells. Three subtypes of MHC structures containing diamond-, star-, and unilaterally concave hexagon-shape cells were designed and fabricated by 3D printing. Quasi-static uniaxial compression experiments and numerical simulations were carried out to uncover the mechanical characteristics of MHC structures. Theoretical analysis was conducted to predict the equivalent Young's modulus and densification strain of MHC structure. The effects of hybridization direction, interior angle of cell, wall thickness allocation, and strut length on the properties of MHC structures were delved. The main factor controlling the specific energy absorption (SEA) of MHC structure was distinguished. Results show that MHC structures possess the characteristics of multi-plateau stresses and adjustable macro-Poisson's ratio. Compatible deformation between sign-opposite Poisson's ratio cells together with controllable sequential layer-by-layer crushing leads to multi-stable deformation states coupled with sign-switching Poisson's ratios of MHC structures during quasi-static uniaxial compression, which are conducive to multiple energy absorption. Compared with single Poisson’s ratio cellular structures (SPCSs), MHC structures exhibit much higher multi-plateau stresses and energy absorption capacity. When the hybridization direction is parallel to the loading direction, MHC structures are superior to SPCSs in terms of both plateau stress and SEA. The SEAs of MHC structures do not change monotonously and have optimum ranges with interior angle, wall thickness allocation, and strut length. Strut length is the main control factor for SEA. This work showcases good application potential of MHC structures in structural protection fields, and paves a new way for designing multistable structures with adjustable macro-Poisson's ratio.

{"title":"Mechanical characteristics of novel multistable hybrid cellular structures with adjustable macro-Poisson's ratio","authors":"Ran Liu , Changhai Chen , Yuansheng Cheng","doi":"10.1016/j.tws.2025.113356","DOIUrl":"10.1016/j.tws.2025.113356","url":null,"abstract":"<div><div>To achieve superior energy absorption capacity with multi-plateau stresses, a novel type of multistable hybrid cellular (MHC) structure was constructed through the hybridization of positive, negative, and zero Poisson's ratio cells. Three subtypes of MHC structures containing diamond-, star-, and unilaterally concave hexagon-shape cells were designed and fabricated by 3D printing. Quasi-static uniaxial compression experiments and numerical simulations were carried out to uncover the mechanical characteristics of MHC structures. Theoretical analysis was conducted to predict the equivalent Young's modulus and densification strain of MHC structure. The effects of hybridization direction, interior angle of cell, wall thickness allocation, and strut length on the properties of MHC structures were delved. The main factor controlling the specific energy absorption (<em>SEA</em>) of MHC structure was distinguished. Results show that MHC structures possess the characteristics of multi-plateau stresses and adjustable macro-Poisson's ratio. Compatible deformation between sign-opposite Poisson's ratio cells together with controllable sequential layer-by-layer crushing leads to multi-stable deformation states coupled with sign-switching Poisson's ratios of MHC structures during quasi-static uniaxial compression, which are conducive to multiple energy absorption. Compared with single Poisson’s ratio cellular structures (SPCSs), MHC structures exhibit much higher multi-plateau stresses and energy absorption capacity. When the hybridization direction is parallel to the loading direction, MHC structures are superior to SPCSs in terms of both plateau stress and <em>SEA</em>. The <em>SEA</em>s of MHC structures do not change monotonously and have optimum ranges with interior angle, wall thickness allocation, and strut length. Strut length is the main control factor for <em>SEA</em>. This work showcases good application potential of MHC structures in structural protection fields, and paves a new way for designing multistable structures with adjustable macro-Poisson's ratio.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"214 ","pages":"Article 113356"},"PeriodicalIF":5.7,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of semi-rigid RHS T-joints with self-drilling screws

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-04-19 DOI: 10.1016/j.tws.2025.113350

André N. GARCIA , Carlos LÓPEZ-COLINA , Miguel A. SERRANO , Ismael GARCÍA , Luciano R.O.DE LIMA , Fernando L. GAYARRE

This paper presents a study on an innovative type of joint between rectangular steel hollow sections (RHS), which can be used in light structures. These joints are fabricated by partially inserting one of the members into the other and then using self-drilling screws to join them effectively. The width of both profiles has to match with a difference of 10 mm, which allows the use of 4 mm thick profiles for the outer piece. The self-drilling screws are placed on both lateral faces, and they are submitted to shear. The joints are easy to mount, reducing execution costs. The rotational stiffness of the joint can be analytically calculated through some simplified assumptions if the linear stiffness of the individual component, composed of the self-drilling screw and its surrounding area, is determined adequately. This work presents some experimental results and the analytical proposal for their design as semi-rigid joints, by applying a simplified component-based method. The results demonstrate the applicability of these joints and the proposed formulation to light steel structures that can be easily fabricated and mounted with ordinary tools and without specific expertise in execution.

{"title":"Characterization of semi-rigid RHS T-joints with self-drilling screws","authors":"André N. GARCIA , Carlos LÓPEZ-COLINA , Miguel A. SERRANO , Ismael GARCÍA , Luciano R.O.DE LIMA , Fernando L. GAYARRE","doi":"10.1016/j.tws.2025.113350","DOIUrl":"10.1016/j.tws.2025.113350","url":null,"abstract":"<div><div>This paper presents a study on an innovative type of joint between rectangular steel hollow sections (RHS), which can be used in light structures. These joints are fabricated by partially inserting one of the members into the other and then using self-drilling screws to join them effectively. The width of both profiles has to match with a difference of 10 mm, which allows the use of 4 mm thick profiles for the outer piece. The self-drilling screws are placed on both lateral faces, and they are submitted to shear. The joints are easy to mount, reducing execution costs. The rotational stiffness of the joint can be analytically calculated through some simplified assumptions if the linear stiffness of the individual component, composed of the self-drilling screw and its surrounding area, is determined adequately. This work presents some experimental results and the analytical proposal for their design as semi-rigid joints, by applying a simplified component-based method. The results demonstrate the applicability of these joints and the proposed formulation to light steel structures that can be easily fabricated and mounted with ordinary tools and without specific expertise in execution.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"213 ","pages":"Article 113350"},"PeriodicalIF":5.7,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143858936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Elastic-plastic buckling of externally pressurized auxetic domes

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-04-19 DOI: 10.1016/j.tws.2025.113324

J. Błachut, M.D. White

The paper studies the effect of inclusion of auxetic layer(s), into the wall of externally pressurized torispherical shells, on buckling. Both the base and auxetic layers are assumed to be isotropic and undergo elastic-plastic behavior. In the first instance, load carrying capacities are computed for the Negative Poisson’s Ratio (NPR), within -0.9 and +0.3, and for various wall configurations including: (i) single auxetic layer, (ii) sandwich wall with the auxetic layer embedded between two metallic faces, and (iii) two layer wall with the metallic outer layer and auxetic inner layer. Substantial gains in magnitudes of buckling pressure are recorded depending on the wall construction. This heavily depends on the diameter-to-wall thickness (D/t)-ratio varying between 500 and 2000. Next, the influence of Young’s modulus of the auxetic layer on buckling strength was examined. For E_auxetic equal to 10 % of E_steel, in two layer head (0.25t-steel and 0.75t-auxetic), one is able to have the same load carrying capacity as if the head had 100 % metallic wall. Finally, structural optimization was employed to assess buckling strength on a like-for-like basis due to large variability in magnitude of buckling pressure. In one specific case, the ratio of the best to the worst buckling pressure, within the admissible design parameters, was found to be 4.8. Large gains in the magnitudes of buckling pressure were also recorded for other optimal configurations. Zero order search technique coupled with a reliable re-analysis tool was employed here.

{"title":"Elastic-plastic buckling of externally pressurized auxetic domes","authors":"J. Błachut, M.D. White","doi":"10.1016/j.tws.2025.113324","DOIUrl":"10.1016/j.tws.2025.113324","url":null,"abstract":"<div><div>The paper studies the effect of inclusion of auxetic layer(s), into the wall of externally pressurized torispherical shells, on buckling. Both the base and auxetic layers are assumed to be isotropic and undergo elastic-plastic behavior. In the first instance, load carrying capacities are computed for the Negative Poisson’s Ratio (NPR), within -0.9 and +0.3, and for various wall configurations including: (i) single auxetic layer, (ii) sandwich wall with the auxetic layer embedded between two metallic faces, and (iii) two layer wall with the metallic outer layer and auxetic inner layer. Substantial gains in magnitudes of buckling pressure are recorded depending on the wall construction. This heavily depends on the diameter-to-wall thickness (D/t)-ratio varying between 500 and 2000. Next, the influence of Young’s modulus of the auxetic layer on buckling strength was examined. For E<sub>auxetic</sub> equal to 10 % of E<sub>steel</sub>, in two layer head (0.25t-steel and 0.75t-auxetic), one is able to have the same load carrying capacity as if the head had 100 % metallic wall. Finally, structural optimization was employed to assess buckling strength on a like-for-like basis due to large variability in magnitude of buckling pressure. In one specific case, the ratio of the best to the worst buckling pressure, within the admissible design parameters, was found to be 4.8. Large gains in the magnitudes of buckling pressure were also recorded for other optimal configurations. Zero order search technique coupled with a reliable re-analysis tool was employed here.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"214 ","pages":"Article 113324"},"PeriodicalIF":5.7,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Accurate characterization and experimental study on traveling wave resonance of high-speed thin-walled bevel gear of aero-engine

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-04-18 DOI: 10.1016/j.tws.2025.113345

Xiaochi Luan , Shenghong Wang , Yundong Sha , Maoqiang Zhang , Gongmin Liu

Aiming at the problems of traveling wave resonance (TWR), unclear stress distribution and vibration response characteristics of aviation high-speed thin-walled bevel gears, a transient dynamic simulation model of TWR of aviation high-speed bevel gears close to the actual meshing state, constraints and loads is established. The explicit dynamic algorithm is used to solve the model, and the effective characterization of the dynamic response characteristics of TWR of bevel gears is realized. The distribution state and spectral structure characteristics of the TWR displacement and stress response of the gear are accurately described. The distribution form and migration characteristics of the TWR stress field of the bevel gear are given for the first time. The validity and accuracy of the simulation model are verified by experiments. The results show that under the resonance conditions of the 3rd ND forward traveling wave (FTW) and the 4th ND backward traveling wave (BTW), the axial vibration displacement field of bevel gear is characterized by the rapid migration of sector distribution. The resonant stress field of the traveling wave shows a petal-like distribution in the circumferential direction, and the stress is concentrated at the center of the root groove fillet. The vibration displacement and stress response of the bevel gear TWR are characterized by the dense distribution of high-order harmonic vibration, and the vibration response at the meshing position is obviously increased, which is characterized by the obvious fluctuation phenomenon with the shaft rotation frequency as the cycle. By comparing the simulation results with the experimental results, it is found that the stress distribution characteristics of the two are consistent, and the magnitude of the results is consistent, which verifies the validity of the TWR transient dynamics simulation model of the bevel gear.

{"title":"Accurate characterization and experimental study on traveling wave resonance of high-speed thin-walled bevel gear of aero-engine","authors":"Xiaochi Luan , Shenghong Wang , Yundong Sha , Maoqiang Zhang , Gongmin Liu","doi":"10.1016/j.tws.2025.113345","DOIUrl":"10.1016/j.tws.2025.113345","url":null,"abstract":"<div><div>Aiming at the problems of traveling wave resonance (TWR), unclear stress distribution and vibration response characteristics of aviation high-speed thin-walled bevel gears, a transient dynamic simulation model of TWR of aviation high-speed bevel gears close to the actual meshing state, constraints and loads is established. The explicit dynamic algorithm is used to solve the model, and the effective characterization of the dynamic response characteristics of TWR of bevel gears is realized. The distribution state and spectral structure characteristics of the TWR displacement and stress response of the gear are accurately described. The distribution form and migration characteristics of the TWR stress field of the bevel gear are given for the first time. The validity and accuracy of the simulation model are verified by experiments. The results show that under the resonance conditions of the 3rd ND forward traveling wave (FTW) and the 4th ND backward traveling wave (BTW), the axial vibration displacement field of bevel gear is characterized by the rapid migration of sector distribution. The resonant stress field of the traveling wave shows a petal-like distribution in the circumferential direction, and the stress is concentrated at the center of the root groove fillet. The vibration displacement and stress response of the bevel gear TWR are characterized by the dense distribution of high-order harmonic vibration, and the vibration response at the meshing position is obviously increased, which is characterized by the obvious fluctuation phenomenon with the shaft rotation frequency as the cycle. By comparing the simulation results with the experimental results, it is found that the stress distribution characteristics of the two are consistent, and the magnitude of the results is consistent, which verifies the validity of the TWR transient dynamics simulation model of the bevel gear.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"214 ","pages":"Article 113345"},"PeriodicalIF":5.7,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An improved closed-form residual stress estimation method for girth welds in thin-walled pipe components

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-04-18 DOI: 10.1016/j.tws.2025.113343

Zetao Jin , Pingsha Dong , Shaopin Song

A reliable residual stress estimation is required for performing fracture mechanics-based structural integrity (or fitness-for-service) evaluations of pressure vessels and pipe components. Recent developments in closed-form estimation methods have shown significant potential for avoiding complex, case-by-case thermo-mechanical finite element simulations. However, for thin-walled pipes, recent studies have shown that existing methods yield inconsistent residual stress estimations. This study presents an improved closed-form residual estimation method by incorporating: (1) finite wall thickness effects on heat dissipation in the analytical estimation of maximum temperature distribution, and (2) an analytical estimation of the plastic zone boundary through a thermo-mechanically coupled formulation enabled by thin-shell theory. The improved method is validated against detailed time-history-based thermo-mechanical finite element models, with two demonstration cases highlighting its improvements. The presented method offers a physically consistent and efficient analytical solution for residual stress estimation in thin-walled pipe components.

{"title":"An improved closed-form residual stress estimation method for girth welds in thin-walled pipe components","authors":"Zetao Jin , Pingsha Dong , Shaopin Song","doi":"10.1016/j.tws.2025.113343","DOIUrl":"10.1016/j.tws.2025.113343","url":null,"abstract":"<div><div>A reliable residual stress estimation is required for performing fracture mechanics-based structural integrity (or fitness-for-service) evaluations of pressure vessels and pipe components. Recent developments in closed-form estimation methods have shown significant potential for avoiding complex, case-by-case thermo-mechanical finite element simulations. However, for thin-walled pipes, recent studies have shown that existing methods yield inconsistent residual stress estimations. This study presents an improved closed-form residual estimation method by incorporating: (1) finite wall thickness effects on heat dissipation in the analytical estimation of maximum temperature distribution, and (2) an analytical estimation of the plastic zone boundary through a thermo-mechanically coupled formulation enabled by thin-shell theory. The improved method is validated against detailed time-history-based thermo-mechanical finite element models, with two demonstration cases highlighting its improvements. The presented method offers a physically consistent and efficient analytical solution for residual stress estimation in thin-walled pipe components.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"213 ","pages":"Article 113343"},"PeriodicalIF":5.7,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the material removal processes and fibre deformation mechanisms in CFRP cutting based on a novel numerical model considering the strain rate effect

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-04-18 DOI: 10.1016/j.tws.2025.113339

Xiaonan Wang , Guangjian Bi , Yongjun Shi , Cheng Zhang , Xuejin Zhao , Fuji Wang

Carbon fibre reinforced plastics (CFRPs) are prone to various cutting-induced damages. An accurate model capable of effectively predicting the material removal and fibre deformation mechanisms would thus aid in reducing these damages and further enhancing machining quality. Previous research has proposed microscopic numerical models to predict the orthogonal cutting of unidirectional CFRPs with the local failure and fracture processes of the constituent phases. However, during the material modelling, the different failure modes of fibres under multi-directional loadings are often neglected, and the variation in resin mechanical properties with strain rate in cutting process is rarely considered. This would lead to inaccurate predictions of the cutting process and fibre deformation extent. To address this issue, this study has developed a novel microscopic numerical model to simulate the CFRP cutting with high precision. In the numerical model, the damage initiation criteria of fibre involve four distinct failure modes and the contributions from stresses in both the principal and shear directions, and the damage accumulation process in fibres is considered by defining evolution laws. Moreover, a constitutive model incorporating the strain rate effect is formulated to characterise the material behaviour of resin during cutting. Based on this numerical model, the machining processes and cutting forces of CFRPs at four typical fibre cutting angles are predicted. The simulation results agree well with the experimental observations, and the prediction accuracy has been improved compared with the numerical model using commonly applied material models of fibre and resin. Furthermore, the effects of processing conditions on fibre deformation are evaluated. The maximum fibre deformation depth is found when the fibre cutting angle is 90°. The fibre deformation depth decreases remarkably with the rise of cutting speed until 1000 mm/s. Additionally, the increased fibre deformation depths are predicted with the higher cutting depths.

{"title":"On the material removal processes and fibre deformation mechanisms in CFRP cutting based on a novel numerical model considering the strain rate effect","authors":"Xiaonan Wang , Guangjian Bi , Yongjun Shi , Cheng Zhang , Xuejin Zhao , Fuji Wang","doi":"10.1016/j.tws.2025.113339","DOIUrl":"10.1016/j.tws.2025.113339","url":null,"abstract":"<div><div>Carbon fibre reinforced plastics (CFRPs) are prone to various cutting-induced damages. An accurate model capable of effectively predicting the material removal and fibre deformation mechanisms would thus aid in reducing these damages and further enhancing machining quality. Previous research has proposed microscopic numerical models to predict the orthogonal cutting of unidirectional CFRPs with the local failure and fracture processes of the constituent phases. However, during the material modelling, the different failure modes of fibres under multi-directional loadings are often neglected, and the variation in resin mechanical properties with strain rate in cutting process is rarely considered. This would lead to inaccurate predictions of the cutting process and fibre deformation extent. To address this issue, this study has developed a novel microscopic numerical model to simulate the CFRP cutting with high precision. In the numerical model, the damage initiation criteria of fibre involve four distinct failure modes and the contributions from stresses in both the principal and shear directions, and the damage accumulation process in fibres is considered by defining evolution laws. Moreover, a constitutive model incorporating the strain rate effect is formulated to characterise the material behaviour of resin during cutting. Based on this numerical model, the machining processes and cutting forces of CFRPs at four typical fibre cutting angles are predicted. The simulation results agree well with the experimental observations, and the prediction accuracy has been improved compared with the numerical model using commonly applied material models of fibre and resin. Furthermore, the effects of processing conditions on fibre deformation are evaluated. The maximum fibre deformation depth is found when the fibre cutting angle is 90°. The fibre deformation depth decreases remarkably with the rise of cutting speed until 1000 mm/s. Additionally, the increased fibre deformation depths are predicted with the higher cutting depths.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"213 ","pages":"Article 113339"},"PeriodicalIF":5.7,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on the post-yield responses and crushing patterns of additively manufactured Rhombic Dodecahedron lattices in biaxial compression

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-04-17 DOI: 10.1016/j.tws.2025.113331

Zhengping Sun , Junjie Zhang , Tuan Hua , Yuxuan Zheng , Yingqian Fu

The flexibility of additive manufacturing facilitates the design and characterisation of numerous lattice configurations for enhanced energy absorption. As lattices sustain complex loading conditions in protective applications, it is essential to ascertain the multi-axial compressive behaviours of lattice structures by experiments. In this study, a homemade biaxial testing machine equipped with customised testing rigs was employed to prescribe direct compression along two perpendicular axes of lattices. The compressive responses of the bending-dominated Rhombic Dodecahedron lattice, fabricated via Fused deposition modelling with polylactic acid filaments, were examined by uniaxial compression, uniaxial compression with lateral expansion constrained, and equi-biaxial compression. The stress-strain responses and crushing patterns of the RD lattices subjected to the three stress states are analysed. It is found that the plateau stress levels of the RD are enhanced by preventing it from lateral expansion. Furthermore, simultaneously augmented strengths along two perpendicular axes are attained by the lattice subjected to biaxial compression, with more deformation localisation bands emerging. In addition, the energy absorption capacity of the RD lattice is also evaluated under various loading conditions. It is concluded that a larger amount of energy can be dissipated under biaxial compression, attributed to the more plastic crushing zones observed during finite deformation. The experimental study can provide new insights into novel lattice designs for energy dissipation in practice.

{"title":"Experimental study on the post-yield responses and crushing patterns of additively manufactured Rhombic Dodecahedron lattices in biaxial compression","authors":"Zhengping Sun , Junjie Zhang , Tuan Hua , Yuxuan Zheng , Yingqian Fu","doi":"10.1016/j.tws.2025.113331","DOIUrl":"10.1016/j.tws.2025.113331","url":null,"abstract":"<div><div>The flexibility of additive manufacturing facilitates the design and characterisation of numerous lattice configurations for enhanced energy absorption. As lattices sustain complex loading conditions in protective applications, it is essential to ascertain the multi-axial compressive behaviours of lattice structures by experiments. In this study, a homemade biaxial testing machine equipped with customised testing rigs was employed to prescribe direct compression along two perpendicular axes of lattices. The compressive responses of the bending-dominated Rhombic Dodecahedron lattice, fabricated via Fused deposition modelling with polylactic acid filaments, were examined by uniaxial compression, uniaxial compression with lateral expansion constrained, and equi-biaxial compression. The stress-strain responses and crushing patterns of the RD lattices subjected to the three stress states are analysed. It is found that the plateau stress levels of the RD are enhanced by preventing it from lateral expansion. Furthermore, simultaneously augmented strengths along two perpendicular axes are attained by the lattice subjected to biaxial compression, with more deformation localisation bands emerging. In addition, the energy absorption capacity of the RD lattice is also evaluated under various loading conditions. It is concluded that a larger amount of energy can be dissipated under biaxial compression, attributed to the more plastic crushing zones observed during finite deformation. The experimental study can provide new insights into novel lattice designs for energy dissipation in practice.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"213 ","pages":"Article 113331"},"PeriodicalIF":5.7,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143858935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Axial performance of locally corroded circular steel tubes strengthened with outer steel and sandwiched concrete jackets

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-04-17 DOI: 10.1016/j.tws.2025.113330

Xinyu Chen, Dong Zhao, Zhenzhen Liu, Shan Li, Yiyan Lu

Hollow steel tubes (HSTs) are extensively utilized in bridge and building structures due to their excellent mechanical properties. However, prolonged service can result in localized corrosion, which compromises their load-bearing capacity. This study introduces a composite strengthening technique that employs outer steel tubes and concrete jackets (STSJC) and examines its reinforcement effect on locally corroded HST columns through experimental testing and finite element (FE) analysis. The findings indicate that this technique significantly enhances the load-bearing capacity and ductility of the specimens, with localized corrosion exerting a particularly pronounced effect on ductility. Furthermore, the FE analysis elucidates the stress concentration caused by localized corrosion, while also reinforcing the collaborative force mechanism between the inner and outer steel tubes and the concrete jackets, thereby augmenting the proportion of load supported by the concrete. Additionally, the study assesses existing load-bearing capacity calculation models, with Han's model exhibiting the highest applicability.

空心钢管（HST）因其优异的机械性能而被广泛应用于桥梁和建筑结构中。然而，长期使用会导致局部腐蚀，从而影响其承载能力。本研究介绍了一种采用外钢管和混凝土护套（STSJC）的复合加固技术，并通过实验测试和有限元（FE）分析研究了其对局部腐蚀的 HST 柱的加固效果。研究结果表明，该技术可显著提高试件的承载能力和延展性，局部腐蚀对延展性的影响尤为明显。此外，有限元分析还阐明了局部腐蚀造成的应力集中，同时也加强了内外钢管与混凝土护套之间的协同作用力机制，从而提高了混凝土所承受的荷载比例。此外，研究还评估了现有的承载能力计算模型，其中 Han 的模型适用性最高。

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引用次数: 0

Prediction of fracture in metallic plates based on the phase-field approach

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-04-16 DOI: 10.1016/j.tws.2025.113323

Hossein Ahmadian , Bahador Bahrami , Majid R. Ayatollahi , Mohammad Reza Khosravani

Studying the failure of ductile materials is crucial for designing engineering structures. Ductile failure, associated with plastic deformation, makes failure analysis complex and computationally expensive. This study aims to analyze the fracture of cracked/notched ductile plates with different geometries and loading conditions (mode I, mixed mode I/II, and mode II), resulting in 41 analyses. First, it employs concepts that equate ductile materials with brittle ones. Then, these concepts are combined with the phase-field method (PFM) applied to brittle fracture to predict the fracture behavior of weakened metallic plates. Based on material properties, we couple the PFM with the equivalent material concept (EMC), the modified EMC (MEMC), and the fictitious material concept (FMC) to predict fracture load and initiation angle. The numerical results are validated with available experimental data, demonstrating that the proposed framework accurately predicts the fracture of ductile materials, with an accuracy of ±10 %. Additionally, the proposed approach has demonstrated superiority over other methods for predicting the fracture load of ductile plates, including average strain energy density (ASED), mean stress (MS), and maximum tangential stress (MTS).

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引用次数: 0